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. GRINDING PAN.

Patented June 13, 1893.

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UNITED STATES PATENT OFFICE.

' WILLIAM G. STEVENSON, OF WELLSVILLE, OHIO, ASSIGNOR TO STEVENSON &

00., OF SAME PLACE.

GRINDING-PAN.

SPECIFICATION forming part of Letters Patent No. 499,367, dated June 13, 1893.

Application filed October 20, 1892. Serial No. 449,513. I (No model.)

T at whom it may concern.-

Be it known that I, WILLIAM G, STEVEN- SON, of Wellsville, in the county of Columbiana and State of Ohio, have invented a new and useful Improvement in Grinding-Pans, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation partly in section of my improved grinding-pan. Fig. 2 is an end elevation, and Fig. 3 is a cross-section of the same.

My invention relates to the construction of that class of grinding pans wherein heavy rollers resting upon a rotary pan are employed; and it consists in certain improvements in the construction and arrangement of the parts, whereby a much stronger and more durable machine is attained, as hereinafter more fully described and set forth in the claims.

In the drawings, in which similar numerals indicate corresponding parts, 2, 2, are castiron end supports for the machine, each support being cast in one piece and integrally with a bed-plate 3. Through bearings 4., 4, secured in the upper portions of these end castings, passes the actuating shaft 5, which communicates motion to the pan -shaft 6 through the bevel-gear 7. The castings 2 are connected bya pair of rods 8 passing through and bolted to the same, the end portions of the rods being reduced, forming shoulders which butt against shoulders 9 upon the castings. Between these rods and carried in pockets at each end is a wooden beam 8, which is centrally perforated to receive the upper bear ing for the pan-shaft. Secured to each of the rods 8 by the collars 10 are a pair of downwardly and inwardly curved and bent hangers 11, between the adjacent lower ends of which is secured the Vertical bearing for the shaft 6, while to their outer sides are secured the two opposite sliding bearings 12. The central leg of each end casting is slotted to form a similar sliding bearing, and supported by bearing-blocks l3 movable in these bearings are independent shafts 14, which carry the crushing-rollers 15. The blocks 13 are ,provided with upwardly-projecting stems 16,

which pass through guides 17, and are surrounded by spiral springs 18, while beneath these blocks are provided rubber buffers 19. The pan proper consists of a central web, a series of radiating arms to' which the perforated pan-plates are secured, and a rim 21. This rim, instead of being made in several parts as formerly, is formed of wrought iron in a single strip bent into circular form, the ends being drawn together by the bolt-connection 22. The arms are each provided with an arc-shoped slot in which the rim fits and is held by bolts 23 passing through angled projections 24 secured to the rim. This method of attaching the rim presents many advantages, since if the rim is broken a duplicate can be at once put in its place and easily secured, whereas in the old-style, on account of the close hand fitting required upon the bolt-holes, the replacing of a broken portion was a long and diflicult task.

The end castings are securely held in place by the bolts 25 passing down through the brick-work, and by the peculiar form of these castings the bearings for the rollers are brought very low and close to the foundation, thus lessening the liability of breakage thereof.

The advantages of my improved construction will be apparent to those skilled in the art. On account of the total absence of joints in the frame-work, there is no loosening and racking of the end-supports, this being also aided by the low position of the bearings for the rollers.

The hanger-connections and rim -attachments are simple, strong and effective, and the entire'machine is found to be more serviceable than former ones of a similar type.

I claim- 1. A frame for grinding pan mills comprising end supports each cast in one integral piece, a horizontal shaft supported in bearings in their upper ends tie rods connecting the supports, hangers carried by the rods and inclined inwardly forming a vertical bearing through which the pan shaft passes, and suitable rolls resting upon the pan; substantially as described.

2. A frame for grinding pan mills comprising end supports each cast in one integral of a metal strip set in grooves or against shoulders in the bottom of the pan, and secured by a bolt and lugs on the strip and on the bottom of the pan; substantially as described.

In testimony whereof I have hereunto set 15 my hand this 1st day of October, A. D. 1892. WILLIAM G. STEVENSON. Witnesses:

J. A. DEIDRICK, K. MENOUGH. 

